Get rid of the custom do-fetch target (which didn't cover all cases)
by using version-specific DIST_SUBDIR instead of appending the version to
DISTFILES. (No PORTREVISION bump since the installed bits don't change.)
Requested by: "Julian Stacey" <jhs@berklix.org>

- Chase updated distfile, at 4.3.7191.6508 now (unfortunately no longer
seems to run on anything < 7)
PR: ports/122865
Submitted by: pointyhat via pav (indedendent of the PR)
Thanks to: various people for testing (my only 7 box has intel gfx
and googleearth on FreeBSD crashes the xserver there,
also the old version...)